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7 August, 02:54

What is the value of the expression 2x2 + 3xy - 4y2 when x = 2 and y = - 4?

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  1. 7 August, 05:17
    0
    -80.

    Step-by-step explanation:

    2 (2) ^2+3 (2) (-4) - 4 (-4) ^2

    8+-24+-64

    8+-88

    -80
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